Scalping and grading device



l (No Model) 2 Sheets-Sheet 1.

A. HUNTER. SALPING AND GRADING DEVICE.

g) Patented Feb. 4, 18.90.

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(No Model.) 2 Sheets- Sheet 2. A. HUNTER. SGALPING AND GRADING DEVICE.

Patented Feb. 4 1890.

' UNITED STATES' xPATENT OFFICE.

ANDREW HUNTER, OF MILI/VAUKEE, IVISCONSIN.

SCALPING AND GRADING DEVICE.

SPECIFICATION forming part of Letters Patent No. 420,802, dated February4, 1890. Application led December 20, 1887- Serial No.l 258,461. (Nomodel.)

To all whom it may concern:

Be it known that I, ANDREW HUNTER, of Milwaukee, in the county ofMilwaukee, and in the State of IVisconsin, have invented certain new anduseful Improvements in Scalping and Grading Devices; and I do herebydeclare that the following is a full, clear, and exact descriptionthereof.

My invention relates to separating devices for the treatment of breaksand chop as well as grain, of the general description known asbreak-scalpers and chop and wheat graders, and will be fully describedhereinafter, and pointed out in the claims.

In the drawings, Figure l is a vertical longitudinal central sectionthrough my improved machine, and Fig. 2 is aside elevation of the same,parts being broken away in both views to better illustrate theconstruction. Figs. 3 to ll, inclusive, are detail views.

A A represent the corner-posts at the head of my machine, and B B likeposts at the tail end, A being the head wall, and B B2 represent therear walls, the latter being the outer wall of a rear extension beyondthe posts B B, there being a partition B3 inline with said posts andwith the wall -B above, said partition B3 and wall B2 forming with theinclined hopper-boards B4 `a spout for the tailings.

C C are the side walls, and C C are inclined cant-boards projectinginwardly from the lower portions of said side walls.

D D are other and interior cant-boards arranged at right angles to thecant-boards C to form, in connection with them, a four-sided hopper witha discharge-opening at a, the board D only extending up as high as thetop of the partition B3 and cant-boards C,

while the board I) extends up to the crossbar A2, which bar extendsacross the head wall A, as shown.

F is ascreen which is supported at an angle of practically twenty-sevendegrees (so as to have a rise of six and a quarter inches to thefoot,which I nd by repeated experiment to be the most desirable) acrossthe inner surface of the machine from side to side, the side pieces ofsaid screen resting upon the inwardly-proj ecting arms c ofvertically-adjustable brackets E, (shown in detail in Fig. 3,) whicharms c project within the machine through slots c in the described sideWalls C of the machine,

and said bracket-s have upwardly-extending flanges (bearing against theoutside of the said walls C) provided with slots e4, for the receptionof set-bolts e5, and below said' slots the said brackets have lateralarms or flanges e2, which flanges close the described slots c in theside walls C against the admission of air.

Below each bracket .E is a stationary angle-plate E', rigidly secured tothe exterior of the wall C, and the lateral arm or flange e of whichplate E carries an adjusting-screw e3, which bears against the underside of the described lateral flange e2 of the adjacent bracket E, andthe said brackets can be raised in v adjustment by loosening the boltsc5 and turning the adj ust-ing-screws e3, and thereby the screen F,supported, as stated, on the arms of said brackets, can be adjusted tothe required height above the cam-shafts G G', as hereinafter explained.

On the under side of the screen F, at each end, are transverse strips ofwood f, and near each end of each strip f the same is covered on itsunder side with a piece of leather or othersuitable material f', (suchas rawhide or even soft-metal,) which can be renewed or replaced whenworn out with but little trouble, as the pieces are located near thecorners of the screen-frame. The mann-er of securing these pieces f(which I term i1npact-pieces,) is shown in detail in Figs. 8 and 9 andin Fig. 7, (which is a section on the line 7 7 of Figs. 6 and 8.) Theimpact pieces f are oblong in shape, cut away at the corners at one end,as shown at f2 f2, leaving a narrow tongue f3 between thcm, and a metalloop F receives said tongue, the ends fL f4 of said loop tting againstthe under side of the wooden strip f, where thecorners of the leatherhave been cut away at f2 f2, and are secured to said strip by screws.The other end of the piece f is clamped to the strip f by an angle-plateF2, Whose vertical flange is secured to the edge of the wooden strip fby screws, as shown.

My screen F is strengthened by means of transverse rods or braces F3,extending from one side to the other above the screen at suitableintervals, which are preferably wooden rods, to insure lightness, orelse light iron rods having set-nuts, as shown.

Just below the described wooden strips f f are the transverse shafts GG', (the lower or IOO rear shaft G being shown in detail in Fig. 6,which is aseetion on the line 6 Gof Fig. 1,) the ends of which shaftsproject through the side walls C C and are journaled tothe postsA A andB B, respectively, the ends which project through the wall C, oppositeto that shown in Fig. 2, carrying sprocket-wheels g g/,connected by asprocket-chain g, (shown in dotted lines in Figs. 1 and 2,) and eachshaft G G' carries near each end, inside the machine and just under theimpact pieces or leather-covered portions f' of the strips f, acam-wheel G2, (having, preferably, three cam-points,) and motion torevolve these shafts G G' and their attachments is communicated from anysuitable power by means of pulley G3 on the other end of the front orupper shaft G and belt g2.

Il Il are two iron shafts, the rear or lower shaft Il' being shown indetail in Fig. 5, (which is a section on the line 5 5 of Fig. 1,) andthis shaft passes through slots c' c' in the side walls C G, its endsbeing journaled in the adjustable boxes J J, which have iianges bearingagainst the outside of the walls C, said tianges being provided with'Aslots j, through which and the adjacent walls C securing-bolts j'extend, so that by loosening the nuts on said bolts j the boxes J may beshifted up or down, carrying the shaft H' with them, and the nuts againtightened to place after this adjustment. This shaft Il' carries twosprocket-wheels h JL, situated near the ends thereof within the machine.The upper or front shaft I-l is similarly jour- .naled, except that oneend of said shaft projects through its box and carries on its end thepulley H2. This shaft I-l carries similar sprocket-whees 7L h within themachine in line with those on the shaft H', and the correspondingsprocket-wheels on each shaft are united by sprocket-chains 7L,whichchains are connected together by a transverse bar 112, secured to thechains, and from one edge of said bar there rises the scraper or brushh2. (Shown as a leather scraper, but which may be a wire or bristlebrush, if desired, or of any preferred material.)

The object of making the boxes J adjustable is to enable thesprocket-chains, which carry the brush or scraper, to be moved nearer toor farther from the under side of the screen F, as found necessary inany given case or at any time.

Intermediate between the boxes J J described t-he side walls C C areprovided with other slots c2 c2, for the passage therethrough of woodenrods I I', whose ends rest in adjustable boxes J J, identical with thosedescribed for the ends of the shaft H', as shown in detail in Fie. 4,and these' rods are united by a pair of longitudinal wooden strips I2I2, which serve as guides or supports for the brush or scraper bar H3,moving thereover, as shown in Fig. 5,and the boxes J J of these rods l2I2 are made adjustable for the same reason that the boxes of the shaftsll Il' are so made.

K, Fig. 1, represents an elastic strip, of wood or metal, extending froma beam A2 at the tail end of the machine to about the center of thescreen, and there connected to the side piece of the screen F, as shown.There are two of these elastic strips K-one connected to each side pieceof the screen to prevent any end movement of said screen, and to keep italways square, and to prevent any jumping motion of the screen springs7c are provided, resting on the upper edge of each side piece of saidscreen,tl1e upper ends of said springs bearing against brackets k',which latter are made adjustable by slot and set-screw, as shown.

L, Fig. 10, (which figure is a section on the line 10 10 of Figs. 1 and2,) represents the feed-pipe of the hopper, which leads to the casing M,extending across the head end of the machine, and within this casing arelocated series of dividing and guiding strips on on, rising from shaftsm', which strips are set at such an angle that the material fed throught-he spout L will iiow easily over them, while, whenever desired, theangle of any of said strips m maybe changed by turning the handles m2 onthe outer projecting ends of their supporting-shafts, and fastening saidhandles, by turning their set-screws m3 against the outside of thecasing M, (or into holes formed in the outside of said casing,) so as tocause said material to fall between said strips 'm at such points in itsdownward passage.

The casing M has a metal bottom M', provided with a series of openingsow, which may be partially closed by drawing the cutoff bar M2 more orless across them, said bar having transverse screw threads formedtherein, which receive adjusting-screws m5, and by turning the heads ofwhich the said bar will approach or recede from the front of the casing,thereby closing or uncovering the said openings fm, there beingtransverse strips m6 across the side walls of the casing M, to preventthe bar M2 from rising, and through the said openings mi there extendscrews or pins f5, rising from the head end of the screen F, to serve asagitators and stir up the material in the casing M, all as clearly shownin Fig. 1 and in the detail view, Fig. 11, which is a section taken onthe line l1 1l. of Fig. 1.

For convenience in obtaining access to the screen F, as in replacing theworn-out leather impact pieces described, or for oiling or cleaning orin removing said screen, the head wall A may be made in sections, so asto have a removable portion extending from just above the beam A2 tojust below the casing M, and similarly the rear wall B2 may have a likeremovable portion extending from, say, about the line of the top of thepartition B13 up to the horizontal board A4, which connects the beam ASwith said wall B2, and these removable pieces may be held in place IOOin any ordinary manner, as by means of the pins and buttons shown. Ishow a hinged door A5 on the top of my machine, as well as hand-holes C2in the side walls C, closed by covers C3, all of ordinary construction.

The operation of my device is as follows: Power being applied to theshaft G and the parts being arranged as shown in Fig. l, the material tobe operated upon is fed* through the spout L into the casing M, whenceit falls over and between the dividing and guiding strips m, ashereinbefore described, onto the head end of the screen F, which, byreason of its being set at the described angle, has an inclinationalmost suiiicient for the material to run off by its own gravity, andthen by the impacts of the cam-wheels against the leather-covered pieceson the under side of the said screen vthe said material is caused totravel rapidly downward, while at the same time, by reason of saidimpacts, the finer portions are precipitated and forced through themeshes of the screen, falling into the described four-sided hopper andout at @,While their tailings fall over the tail end of the screen intothe described spout prepared for their reception, and the said impactstend to prevent clogging of the screen-meshes. In the event of saidmeshes becoming clogged from any cause, (such as a change in theweather, or in the condition of the material,) my hereinbefore-describedscraper or brush is brought into use, which may be automatic, by simplyconnecting the pulley H2 on shaft H with a pulley Gr4 on the' end ofshaft G by belt g3, as shown in Fig. 2, or if there is only anoccasional clogging `this belt g3 need not be used, and a crank may befitted tothe end of said shaft H and the brush or scraper operated a fewtimes by hand whenever required.

WVhile my preferred angle of inclination for the screen F is, as stated,practically twentyseven degrees for most material which would be treatedin said machine, certain material may require a slight variation fromthis angle, and my screen, if set at an angle of about twenty degrees,will do the work but slowlythat is, will scalp the breaks for ahundredbarrel mill in one day-whereas if set at twenty-seven degrees,with the same material, it will scalp five times -as much in the sametime, the best effects being obtained when the screen is set at such anangle as will hold the material (whatever it may be) on it just at thepoint of moving by its own gravity, yet requiring impacts to set it inmotion.

By substituting silk bolting-cloth for wire in the screen my device maybe adapted for bolting iiour.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

l. In a scalping and grading device, the combination, with an inclinedscreen, of adjustable brackets for supporting the screenframe, a pair ofelastic strips extending from the frame of the machine to about thecenter of the screen-frame and secured to the side pieces thereof,impact pieces on the lower side of the screen-frame, at or near thecorners thereof, transverse shafts located beneath said screen, andcam-wheels adapted for contacts or impacts with the corners of thescreen-frame. Y

. 2. In a scalping or grading device, the combination of an inclinedscreen having impact pieces at the corners of the under side of itsframe, with adjustable brackets for supporting the screen-frame,transverse shafts locatedrbeneath the screen, and bearing camwheelsadapted for impacts against the said corners of the screen-frame, and ascraping device secured to sprocket-chains traveling oversprocket-wheels on transverse shafts located between the said cam-shaftsand scraping the under side of the said inclined screen.

3. In a scalping and grading device, the combination, with an inclinedscreen and hopper or feed-spout, of an intermediate casing having aperforated bottom, a series of adjustable dividing and guiding stripsrising from pivoted shafts, locking devices on said shafts, a series ofagitating-pins rising from the screen and projecting through theperforations in the bottom of the casing, and a cutoff bar provided withadj Listing-screws to vary the size of the said openings in the bottomof the said casing.

In testimony that I claim the foregoing I have hereunto set my hand, atMilwaukee, in

the county of Milwaukee and State of Visconsin, in the presence of twowitnesses.

- ANDREW HUNTER.

Witnesses:

H. G. UNDERwooD, WILLIAM KLUG.

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